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The hot water that is used while showering or bathing still has a high temperature when going down the drain. This concept is to not loose this energy. The used hot water is flowing through a long coiled tube that is embedded in a heat storing material. The heat is transfered to this material and is then slowly emitted into the air and therefore kept inside the building. The thermal harvester is also acting as a bathmat while radiating its stored heat slowly even long after showering. The base with the embedded copper tubes is cast from concrete that is mixed with soapstone chunks and copper fibres for good heat transfer and storage.